Realizing high-performance thermoelectric modules through enhancing the power factor <i>via</i> optimizing the carrier mobility in n-type PbSe crystals

Wang, Siqi; Wen, Yi; Bai, Shulin; Zhao, Zhe; Li, Yichen; Gao, Xiang; Cao, Qian; Chang, Cheng; Zhao, Li-Dong

doi:10.1039/d4ee00433g

Energy Environ. Sci.

2024

DOI: 10.1039/d4ee00433g

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Realizing high-performance thermoelectric modules through enhancing the power factor via optimizing the carrier mobility in n-type PbSe crystals

Siqi Wang,

Yi Wen,

Shulin Bai

et al.

Abstract: The limited availability of Te poses challenges for the widespread application of Bi2Te3-based thermoelectric modules. In this work, we explored the thermoelectric module potential of Te-free PbSe by elevating its...

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Cited by 12 publications

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High‐Performance GeSe‐Based Thermoelectrics via Cu‐Doping

Zhang,

Shi,

Mao

et al. 2024

Adv Funct Materials

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Rhombohedral GeSe is a promising p‐type thermoelectric material, noted for its low toxicity, environmental friendliness, and greater affordability compared with tellurides. However, its thermoelectric performance still requires further enhancement for practical applications. In this work, a highly competitive peak figure of merit (ZT) of 1.24 at 623 K for p‐type polycrystalline Ge0.895Cu0.005Se0.9(AgBiTe2)0.1, along with a high average ZT of 0.74 between 323 K and 623 K is reported. Comprehensive micro/nanostructural characterization reveals that alloying with AgBiTe2 and doping with Cu successfully induce dense point defects, secondary Ag2Te phases, and various nanoprecipitates in the GeSe matrix. These abundant crystalline and lattice defects result in strong phonon scattering, leading to an ultra‐low lattice thermal conductivity of 0.35 W m−1 K−1 at 623 K. Moreover, Cu doping enhances carrier mobility, promoting decoupling between carriers and phonons. This allows for low thermal conductivity and high power factor coexistence to achieve a high ZT. Additionally, with a temperature difference of 325 K, the theoretical energy conversion efficiency reaches up to 8.5%, indicating great potential for medium‐temperature device applications. This work suggests that Cu doping is an effective strategy for achieving high thermoelectric performance in rhombohedral GeSe‐based materials.

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High‐Performance GeSe‐Based Thermoelectrics via Cu‐Doping

Zhang,

Shi,

Mao

et al. 2024

Adv Funct Materials

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Disordered Order Enables High Out‐of‐Plane ZT in PbSnS₂ Crystals

Zhan,

Wen,

Qin

et al. 2024

Advanced Energy Materials

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High‐performance thermoelectric materials enable waste heat recovery, providing an effective avenue for sustainable development. The concept of “phonon‐glass electron‐crystal” is considered as an ideal approach to achieve high‐performance thermoelectric materials. However, achieving this perfect state remains a significant challenge due to the coupled transport parameters. In this work, long‐range order and short‐range disorder (disordered order) in n‐type PbSnS2 crystals are successfully realized through alloying Se, which enable the synergistic optimization of electron and phonon transport. The improvement of crystal symmetry weakens the distortion of the average long‐range order, leading to a high carrier mobility and promoted electrical transport performance. Meanwhile, the local structure analyzed by X‐ray absorption fine structure spectra reveals a strengthened short‐range disorder, resulting in the enhanced phonon scattering and thus ultralow lattice thermal conductivity. As a result, the disordered order enables a high ZT ≈ 1.7 in PbSnS2‐Cl‐30%Se crystal at 733 K along the out‐of‐plane direction. Moreover, the single‐leg device fabricated using this crystal produces a power generation efficiency of ≈7.2% at temperature difference of 378 K. This work demonstrates the realistic feasibility of disordered order to fulfill the ideal “phonon‐glass electron‐crystal” thermoelectric material, which opens up new avenues for performance optimization.

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PbSe Thermoelectrics: Efficient Candidates for Power Generation and Cooling

Liu,

Qin,

Zhao

2024

Advanced Energy Materials

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Thermoelectric materials enable efficient and clean conversion between heat and electricity, offering significant application prospects in waste heat recovery and solid‐state cooling. Lead selenide (PbSe) is a more abundant and cost‐effective alternative to PbTe with promising potential for mid‐temperature applications. However, things have changed very recently with the discovery of the traditional power generator PbSe being rather competitive as a thermoelectric cooler, opening new avenues for investigating this compound. This review aims to comb how the research achievements and promising performance of PbSe have shifted from medium to near‐room temperatures, by comprehensively discussing various strategies to enhance the thermoelectric efficiency at different temperature ranges. Subsequently, it is reviewed how these advances in materials have triggered deep investigations on constructing high‐efficiency power generation and cooling devices based on PbSe. Finally, a personal summary and outlook are presented on how to fully exploit the high‐ranged thermoelectric performance of PbSe materials and manufacture high‐efficiency power generators and coolers, thus promoting practical applications in the future.

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Realizing high-performance thermoelectric modules through enhancing the power factor via optimizing the carrier mobility in n-type PbSe crystals

Abstract: The limited availability of Te poses challenges for the widespread application of Bi2Te3-based thermoelectric modules. In this work, we explored the thermoelectric module potential of Te-free PbSe by elevating its...

Cited by 12 publications

References 44 publications

High‐Performance GeSe‐Based Thermoelectrics via Cu‐Doping

High‐Performance GeSe‐Based Thermoelectrics via Cu‐Doping

Disordered Order Enables High Out‐of‐Plane ZT in PbSnS₂ Crystals

PbSe Thermoelectrics: Efficient Candidates for Power Generation and Cooling

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Realizing high-performance thermoelectric modules through enhancing the power factor via optimizing the carrier mobility in n-type PbSe crystals

Abstract: The limited availability of Te poses challenges for the widespread application of Bi2Te3-based thermoelectric modules. In this work, we explored the thermoelectric module potential of Te-free PbSe by elevating its...

Cited by 12 publications

References 44 publications

High‐Performance GeSe‐Based Thermoelectrics via Cu‐Doping

High‐Performance GeSe‐Based Thermoelectrics via Cu‐Doping

Disordered Order Enables High Out‐of‐Plane ZT in PbSnS2 Crystals

PbSe Thermoelectrics: Efficient Candidates for Power Generation and Cooling

Contact Info

Product

Resources

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Disordered Order Enables High Out‐of‐Plane ZT in PbSnS₂ Crystals